CVE-2026-85053 in Chrome
Summary
by MITRE • 09/03/2026
Improper resource exposure in CacheStorage in Google Chrome prior to 152.0.7977.82 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/05/2026
The vulnerability identified as an improper resource exposure within the CacheStorage component of Google Chrome prior to version 152.0.7977.82 represents a critical failure in boundary enforcement mechanisms designed to isolate web content from system resources. This flaw allows for arbitrary code execution inside the browser sandbox, which is typically considered one of the most secure environments in modern software architecture. The CacheStorage API provides websites with a programmatic way to cache responses as part of service workers and progressive web applications. When this component fails to properly restrict access or validate inputs related to cached resources, it creates an avenue for attackers to bypass security controls that are intended to prevent malicious scripts from interacting directly with the underlying operating system or browser internals in unauthorized ways.
From a technical perspective, the root cause lies in how the CacheStorage interface handles resource references and memory management during retrieval operations. An attacker can craft a specific HTML page containing JavaScript code designed to exploit this improper exposure by manipulating cache keys or triggering race conditions that lead to out-of-bounds reads or writes within the sandboxed process. By carefully constructing requests, the malicious script can trick the browser into exposing sensitive internal structures or executing untrusted data as if it were trusted system code. This effectively neutralizes the isolation provided by the renderer process sandbox, allowing the attacker's payload to gain a higher level of privilege than intended for web content. Such vulnerabilities are particularly dangerous because they leverage legitimate functionality of the browser, making them difficult to detect through standard signature-based detection methods without deep behavioral analysis.
The operational impact of this vulnerability is severe due to its potential for remote code execution via a simple user interaction or even fully automated exploitation if combined with other social engineering tactics. A successful exploit allows an attacker to run arbitrary commands on the victim's machine, potentially leading to full system compromise including data theft, installation of persistent malware, or use of the device in botnets. The severity rating of High assigned by Chromium security reflects the ease of exploitation and the high impact on confidentiality, integrity, and availability. Users visiting a malicious website could inadvertently trigger this flaw without any additional steps such as downloading files or clicking complex links beyond standard page loads if the exploit is chained with other techniques like cross-site scripting or drive-by downloads that leverage the cache storage mechanism.
To mitigate risks associated with this vulnerability, immediate action involves updating Google Chrome to version 152.0.7977.82 or later where these boundary checks have been reinforced and input validation logic has been corrected. Organizations should enforce automatic update policies for all endpoints running affected versions of the browser to ensure timely patching against known exploits. Additionally, implementing strict Content Security Policy headers can help limit the scope of scripts that are allowed to interact with CacheStorage APIs, reducing the attack surface available to potential attackers. Monitoring network traffic and process behavior for anomalous activities related to cache operations may also aid in detecting attempted exploitation attempts before they result in successful code execution.
This incident aligns closely with CWE-200 which describes exposure of sensitive information to an unauthorized actor, although in this context the exposed resource is executable logic rather than static data. It also maps to MITRE ATT&CK technique T1059 Command and Scripting Interpreter as the ultimate goal of exploiting such a flaw is often to execute system commands through the compromised browser process. Understanding these mappings helps security teams prioritize remediation efforts based on established frameworks that categorize threats by their behavior and impact rather than just their technical description. Continuous monitoring for similar patterns in future updates will be essential given the evolving nature of web-based attack vectors targeting browser internals.